How do I create this shape at the top of a violin (the scroll?)
You could begin with a Curve &gt; Curve Spiral &gt; Archemedian (with the addon Add Curve: Extra Objects). Reduce its Radius Growth:

Covert to mesh, extrude down:

Fill the faces along the spiral:

Flatten the top on the Z axis:

Continue to model:


Then at one point select all and Mesh &gt; Symmetrize on the Z axis: